package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        /*
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");
        //互转
        String str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str2 = builder3.toString();
         */
        String str="好好学习java";
        StringBuilder builder=new StringBuilder(str);
        builder.append(",我胡汉三回来了");
        System.out.println(builder);
        builder.replace(9,19,"我还会回来的");
        System.out.println(builder);
        builder.delete(0,3);
        System.out.println(builder);
        builder.insert(0,"好好学");
        System.out.println(builder);
    }
}
